名詞 notochord:

1. a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates

no.to.chord

n.（名詞）
A flexible rodlike structure that forms the main support of the body in the lowest chordates, such as the lancelet; a primitive backbone.
脊索：細(xì)胞構(gòu)成的一條縱長可彎曲的桿狀結(jié)構(gòu)，其作用是引導(dǎo)產(chǎn)生神經(jīng)板，形成軀體的支持軸
A similar structure in embryos of higher vertebrates, from which the spinal column develops.
脊索：更為高等的脊椎動物胚胎中的類似結(jié)構(gòu)，脊椎骨由此發(fā)育

來源：
Greek nôton [back]
希臘語 nôton [后背]
chord 2
chord2

【引伸】
no.tochord.al
adj.（形容詞）